Empirical insights into residual emissions in urban net-zero targets | Nature Climate Change

Nature & Climate Perspective

**Urban residual emissions heighten demand for peri-urban LULUCF sinks and high-durability carbon removals to neutralize persistent municipal emissions. **

• Municipalities face biophysical limits in local sequestration, requiring high-integrity LULUCF and peri-urban Blue Carbon integration to balance hard-to-abate urban footprints.
• Reliance on biological sinks to neutralize ongoing fossil fuel combustion creates ecological permanence vulnerabilities under increasing urban heat island and drought stress, conflicting with ICVCM permanence requirements.
• Clarifying municipal baseline accounting prevents double-counting of local carbon sink capacity between municipal boundaries and national greenhouse gas inventories.

Market & Policy Outlook

**Empirical definition of residual emissions forces urban policies to align with SBTi neutralization thresholds and drives municipal demand toward CCP-labeled credits. **

• City net-zero roadmaps are shifting toward SBTi-aligned standards, capping allowable residual emissions at 5–10% and requiring direct structural abatement across heating and transport before neutralization.
• Municipal procurement guidelines are increasingly mandating ICVCM Core Carbon Principles (CCPs) and exploring Article 6.2/6.4 ITMO structures for cross-border carbon credit procurement to de-risk municipal claims.
• Urban compliance frameworks are standardizing embodied carbon limits under LEED and municipal Scope 3 mandates to compress the volume of residual emissions entering long-term neutralization liabilities.